首先,我将描述客户端,因为它对两种情况都是相同的。
client.py
import socket
import sys
import threading
import time
SOCKET_AMOUNT = 10000
HOST, PORT = "localhost", 9999
data = " ".join(sys.argv[1:])
def client(ip, port, message):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((ip, port))
while 1:
sock.sendall(message)
time.sleep(1)
sock.close()
for i in range(SOCKET_AMOUNT):
msg = "test message"
client_thread = threading.Thread(target=client, args=(HOST, PORT, msg))
client_thread.start()
多处理器服务器:
foked_server.py
import os
import SocketServer
class ForkedTCPRequestHandler(SocketServer.BaseRequestHandler):
def handle(self):
cur_process = os.getpid()
print "launching a new socket handler, pid = {}".format(cur_process)
while 1:
self.request.recv(4096)
class ForkedTCPServer(SocketServer.ForkingMixIn, SocketServer.TCPServer):
pass
if __name__ == "__main__":
HOST, PORT = "localhost", 9999
server = ForkedTCPServer((HOST, PORT), ForkedTCPRequestHandler)
print "Starting Forked Server"
server.serve_forever()
多线程服务器:
threaded_server.py
import threading
import SocketServer
class ThreadedTCPRequestHandler(SocketServer.BaseRequestHandler):
def handle(self):
cur_thread = threading.current_thread()
print "launching a new socket handler, thread = {}".format(cur_thread)
while 1:
self.request.recv(4096)
class ThreadedTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
pass
if __name__ == "__main__":
HOST, PORT = "localhost", 9999
server = ThreadedTCPServer((HOST, PORT), ForkedTCPRequestHandler)
print "Starting Threaded Server"
server.serve_forever()
在第一个案例中,使用 forked_server.py 只创建了40个进程,其中大约20个在一段时间后开始出现以下错误:
客户端上的错误。错误:[Errno 104] Connection reset by peer
线程版本更加耐用,可以容纳超过4000个连接,但最终会开始显示
测试是在我的本地机器上进行的,Kubuntu 14.04 x64,内核为v3.13.0-32。这些是我为提高系统整体性能所做的步骤:gaierror:[Errno -5] No address associated with hostname
- 提高文件句柄的内核限制:
sysctl -w fs.file-max=10000000
- 增加连接等待队列的大小:
sysctl -w net.core.netdev_max_backlog = 2500
- 提高最大连接数:
sysctl -w net.core.somaxconn = 250000
- 测试是否正确,我可以依赖这些结果吗?我对所有这些网络/套接字的东西都很陌生,所以请在我的结论中纠正我。
- 多处理器/多线程方法在重载系统中确实不可行吗?
- 如果是,我们还有哪些选择?异步方法?Tornado/Twisted/Gevent框架?